Wet drum magnetic separator treating iron ore

Iron: magnetic separation, with gravity or flotation where the ore is weakly magnetic

Magnetite responds to straight magnetic separation. Hematite and refractory ores need magnetic separation combined with flotation, gravity, or roasting.

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Process route

The split is simple in principle and decided by test work in practice: magnetic susceptibility sets the route, and the reverse flotation stage sets the final grade.

Crushing and pre-concentration

Crushing followed by dry magnetic separation to reject barren rock before grinding, where the ore allows it.

Grinding and classification

Stage grinding with hydrocyclones or spiral classifiers, sized to liberate iron minerals without overgrinding.

Magnetic separation

Wet drum separation in stages for magnetite. High intensity or high gradient separation for weakly magnetic hematite.

Reverse flotation or gravity

Reverse flotation removes silica to lift the concentrate grade. Gravity separation is used where the ore suits it.

Dewatering

Concentrate thickening and filtration, tailings thickening and disposal.

Equipment in this circuit

Manufactured at our own bases and matched to the circuit capacity, not bought package by package.

Jaw crusher

PE series for primary crushing and PEX series for secondary and fine crushing.

High intensity dry drum magnetic separator

Dry magnetic separator

Dry drum separation for pre-concentration and iron removal.

Ball mill

Wet grid mills for primary grinding and overflow mills for secondary grinding.

Spiral classifier

High weir classifier for closed circuit grinding and ore washing.

Magnetic separator

Wet and dry drum, high intensity and high gradient separators.

Thickener

Deep cone and high efficiency thickeners up to 100 m diameter.

Reference projects

Figures are those reported for these projects in the Xinhai project and test brochures.

Mongolia

3,500 t/d iron plant, concentrate at or above 65% Fe with yield around 31%

EPC+O

Hebei, China

3 Mt/a iron processing plant

Plant scope

Shandong, China

0.1 Mt/a high purity iron powder, TFe 52.77% at 48.06% recovery in test work

Test work

Common questions

What concentrate grade is achievable?

It depends on the ore. The Mongolian plant reports iron concentrate at or above 65% Fe with a yield around 31%, and a secondary concentrate at 50 to 60%. Those figures belong to that orebody.

How are refractory iron ores handled?

Roasting followed by magnetic separation is one of the test methods offered, controlled by roasting atmosphere, temperature and time.

Is dry magnetic separation useful before grinding?

On suitable ores it rejects waste early, which cuts grinding energy for the whole plant. Whether it works is a test work question.

Send the assay and the tonnage target for your Iron project.

We start with test work on your sample, then size the circuit around the result. Tell us where the project stands and what you need next.